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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201ae64b86e131b4372546a70f74920a9e1faf1e8cbe7cc44e5537abbf9fc478' 
  AND token = '6Nh0zmsO3L2BmOtBp3b7pbVR97Ewx5fQYEuln7ywxfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}